General Pump YUB21405 Unloader Valve 21 GPM 4050 PSI Blue Spring – OEM Replacement Part

Part Number: YUB21405
Category: Pressure Washer Components → Unloader Valves → General Pump Parts
Type: General Pump Unloader Valve with Blue Spring

The General Pump YUB21405 Unloader Valve is a genuine OEM pressure-actuated unloader designed for high-flow commercial and industrial pressure washer systems. Engineered to provide reliable pressure regulation and bypass protection, this heavy-duty unloader valve supports flow rates up to 21 GPM and operating pressures up to 4050 PSI, with a maximum pressure rating of 4500 PSI.

Key Features & Benefits

• Genuine General Pump OEM Replacement Part
• Heavy-duty pressure-actuated unloader valve
• Supports flow rates up to 21 GPM
• Rated operating pressure of 4050 PSI
• Maximum pressure rating of 4500 PSI
• Blue spring for high-flow pressure applications
• Large 1/2" port configuration for maximum flow
• Provides reliable pressure regulation and bypass control
• Helps protect pumps from excessive pressure buildup
• Ideal for commercial and industrial pressure washer systems

Technical Specifications

Manufacturer: General Pump

Part Number: YUB21405

Product Type: Unloader Valve

Spring Color: Blue

Rated Pressure: 4050 PSI

Maximum Pressure: 4500 PSI

Maximum Flow Rate: 21 GPM

Valve Type: Pressure-Actuated Unloader

OEM Replacement: Yes

Port Configuration

Inlet Port:

• 1/2" Inlet

Outlet Port:

• 1/2" Outlet

Bypass Port:

• 1/2" Bypass

Typical Applications

• Industrial pressure washer systems
• Commercial cleaning equipment
• Fleet washing operations
• Truck and transportation wash facilities
• Agricultural cleaning systems
• Heavy equipment wash bays
• Manufacturing facility cleaning
• Custom high-flow pressure washer builds

Performance Advantages

• Maintains consistent system pressure during operation
• Protects pumps from excessive pressure buildup and dead-heading
• Supports high-volume cleaning applications up to 21 GPM
• Provides reliable bypass operation when trigger guns are released
• Improves overall system safety and reliability
• Large porting supports maximum water flow efficiency
• Durable OEM construction ensures long service life
• Designed for demanding industrial environments
• Helps maximize pressure washer performance and productivity

Maintenance Recommendations

• Inspect the unloader valve regularly for leaks, wear, or pressure fluctuations.
• Verify pressure settings during routine maintenance intervals.
• Inspect springs, seals, and internal valve components for wear.
• Flush contaminants from the pressure washer system to minimize internal damage.
• Follow General Pump installation and pressure adjustment procedures.
• Use only genuine General Pump OEM replacement parts when servicing the valve.